Relationship of fatigue-crack growth rate in an aqueous corrosive medium to the electrochemical conditions at the crack tip

Panasyuk, V. V.; Ratych, L. V.; Dmytrakh, І. М.

doi:10.1007/bf00720785

Cited by 11 publications

(2 citation statements)

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“…The analysis and the summary of the existed studies on corrosion fracture of metals have shown the principal necessity of consideration and taking into account the physicochemical processes, which directly occur in pre‐fracture zone of a material in the crack tip. Based on it, the following conception of the corrosion fracture mechanics of structural metals has been proposed [9, 15–18]. In a general case, the state of material pre‐fracture zone in the crack tip may be described by the such groups of parameters: P j ( σ ) – parameters that characterise stress state of materials and are function of the external applied load σ ; A n ( τ ) – parameters that determine in time τ physicochemical processes, which occur between deformed material and environment; B m ( S ) – parameters that characterise the state of material surface S .…”

Section: Conception Of Corrosion Fracture Mechanicsmentioning

confidence: 99%

“…They together define invariantly the electrochemical state of the system of ‘material–environment’. Thus, it was assumed that in case of metals fracture in aqueous corrosion environment, the electrochemical processes in pre‐fracture zone in the crack tip can be fully controlled by values of the pH t and E t in the crack tip [9, 17]. The stress intensity factor as one of the most universal characteristic, which comprises the size of the crack, geometry of the structural element and also the mode and value of applied external load F , was chosen for description of the stress state in pre‐fracture zone.…”

Section: Model Of Corrosion Crack Growth Ratementioning

confidence: 99%

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Corrosion Fracture of Structural Metallic Materials: Effect of Electrochemical Conditions in Crack

Dmytrakh

2010

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The work is a compressed review based on the summarised results and the original approach for study of corrosion crack growth, taking into account local electrochemical conditions in the crack tip, which was developed at the Karpenko Physico-Mechanical Institute of NASU. The model scheme of the pre-fracture zone in the corrosion crack tip, which can be defined by the local values of pH of solution, electrode potential of metal E and stress intensity factor K I is proposed. For its realisation, the special method and testing equipment for corrosion crack growth study and local electrochemical measurements in the crack were developed. The variation of the electrochemical conditions in corrosion cracks was studied, and it has been found that some stabilised levels of the pH and E values can be achieved in the tip of a non-propagating and a propagating crack under static and cyclic loading during of exposure time. On this ground, the method for forecasting of the threshold stress intensity factor K ISCC under stress corrosion cracking was proposed using these characteristic values of pH and E. This method was also adopted for the determination of the threshold stress intensity factor K th under corrosion fatigue. The special method for determining corrosion fatigue crack growth rate diagrams based on consideration of extreme electrochemical conditions in the crack tip was developed. It has been proven that such diagrams reflect the extreme influence of the environmental factor on corrosion fracture of material, and they may be recommended as the base for the remaining lifetime calculation of the structural elements exploited under environmental conditions. KEY WORDS: aqueous corrosive environments, crack growth rate, crack-like defects, diagram of crack growth resistance, electrochemical processes, local fracture, pH of solution and electrode potential near crack tip, stress intensity factor, stressed metal Ó

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Section: Conception Of Corrosion Fracture Mechanicsmentioning

confidence: 99%

Section: Model Of Corrosion Crack Growth Ratementioning

confidence: 99%